Original Post can be viewed at Using current_scn for RMAN incremental ? Think again..

I am bloging about experience we had using rman incremental backup for syncing standby database. We had a standby database which lagged by considerable time and we decided to use rman incremental database to make it current. We have done this in past and used normal procedure of taking current_scn from V$database on standby and took [...]

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Original Post can be viewed at Poll on Sql Plan Management

Dominic is conducting poll on SPM and Sql Profiles usage on his website. Link can be found here  I have been using SPM and SQL Profiles (using coe_xfr_profile.sql) to fix plans for queries  and believe me its very easy and quick way of fixing problems in production database. I have not yet used SPM to [...]

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Original Post can be viewed at Oracle Direct connector for HDFS

Some time back oracle had announced Oracle Big Data appliance. Along with this Oracle released Big Data Connectors to facilitate data access between data stored in a Hadoop cluster and Oracle Database. I tried installing Oracle Direct Connector for HDFS (Hadoop distributed file system) and documenting steps below. To use Oracle Direct Connector we need to [...]

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Original Post can be viewed at ORA-7445 core dump [kokscold()+849] from EM 12c

The first problem reported by my EM 12c is an ORA-7445 error. After checking the alert log following is the exact message: Sun Feb 19 12:09:41 2012 Errors in file /u01/app/oracle/diag/rdbms/pkldb/pkldb/trace/pkldb_j035_14712.trc (incident=52961): ORA-07445: exception encountered: core dump [kokscold()+849] [SIGSEGV] [ADDR:0x50] [PC:0x115E16F] [Address not mapped to object] [] Incident details in: /u01/app/oracle/diag/rdbms/pkldb/pkldb/incident/incdir_52961/pkldb_j035_14712_i52961.trc From the incident trace [...]

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Original Post can be viewed at Copying Oracle Scheduler jobs with Arguments

Oracle provides dbms_scheduler.copy_job function to copy oracle scheduler jobs which works great. But problem is that it cannot copy  jobs which have  arguments. Need to copy jobs can arise due to following scenarios 1)Runaway jobs – When Scheduler job is running without any SID. This means OS session is not present and this will not [...]

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Original Post can be viewed at EM12c:Automated discovery of Targets

In this post we will discuss the Automated discovery of Targets in Enterprise Manager Cloud Control(EM 12c). Once you have installed agents, you can schedule automatic discovery of new targets. Let’s get started 1)Click on Add Target>Configure Auto Discovery from the Setup menu 2)Click the Configure icon in the Multiple Target-type Discovery on Single Host row in [...]

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Original Post can be viewed at Em12c:Silent Oracle Management agent Installation

This Post would describe how to install Oracle Management Agent 12c in silent mode. We need to download the agent software which can be done using emcli utility which is present on OMS host.Login to OMS host and execute emcli utility as mentioned below [oracle@oradbdev04]~/Middleware/oms/bin% emcli login -username=sysman Enter password Login successful We need to now [...]

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Original Post can be viewed at 11gR2:Listener Startup Issues

In this blog post I will be discussing listener startup issues faced in 11gR2 RAC. I will be constantly updating this post based on my experiences or any comments on this blog post. Let’s get started.You will experience following errors while starting listener using srvctl [oracle@prod01]~% srvctl start listener -n prod01 PRCR-1013 : Failed to [...]

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Original Post can be viewed at Get Upgrading: Upgrade to Enterprise Manager Cloud Control 12c

This post describes the steps to upgrade an existing 11g Enterprise Manager Grid Control (11.1.0.1.0) to 12c (12.1.0.1.0). The Complete Upgrade process will be carried out under 3 different stages: 1. Patch existing 11g OMS to get the 12c upgrade console. 2. Deploy and Configure 12c agents. 3. Upgrade 11g OMS to 12c. The approach used [...]

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Original Post can be viewed at Cluster SSH tool Utility

Many times you come across scenario’s when you wish to open multiple ssh windows and execute same commands.e.g You wish to see alert log for multi-node RAC simultaneously or edit sysctl.conf files for multiple machines. Cluster SSH utility helps solve this problem as it opens multiple SSH sessions and allows simultaneous control. In case you are [...]

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Original Post can be viewed at 11g: Multiple failed login attempt can block New Application connections

In Oracle database 11g, a new feature/enhancement has potential of bringing down the application due to multiple sessions hitting database with wrong password. As per Bug 7715339 – Logon failures causes “row cache lock” waits – Allow disable of logon delay [ID 7715339.8] In 11g there is an intentional delay between allowing failed logon attempts [...]

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Original Post can be viewed at Optimizer Choosing Nested-Loop Joins Instead of Hash-Joins

In one of my databases, one application query suddenly started to pick Nested-Loop joins instead of Hash-Joins and took almost 6 hours to complete which gets completed in less than 10 secs with Hash-Joins. The same query in another similar database with same configuration and same data is doing fine and using hash joins. There is [...]

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Original Post can be viewed at Oracle Critical Patch Update January 2012

I guess most of us having My Oracle Support have got email from Oracle mentioning that Critical Patch Update January 2012 has been released. Main reason behind this is Security bug found by Infoworld which can make database run out of SCN. You can read the article here Summary There is bug 12371955 which causes scn [...]

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Original Post can be viewed at User Sessions stuck on resmgr:cpu quantum wait event

We were experiencing lot of session getting stuck on resmgr:cpu quantum in our database. In fact at a time we had 70 sessions which were stuck on this wait event and our cpu load average was touching 60 Checking active resource plan, we found that DEFAULT_MAINTENANCE_PLAN was active. As per 11g Docs In this plan, [...]

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Original Post can be viewed at Plan Stability using Sql Profiles and SQL Plan Management

PLAN STABILITY How many times you have noticed a query using Index X when you wanted it to use index Y or query performing Nested Loop join when Hash Join would have completed the query much faster.Or take a scenario when the application suddenly starts using wrong plan after database restart. To solve all these [...]

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Original Post can be viewed at V$SQL_SHARED_CURSOR in 11.2.0.2

Oracle 11.2.0.2 has introduced new column “REASON” to V$SQL_SHARED_CURSORS. I came across this extremely useful column while debugging multiple child cursor issue (11.2.0.2 seems to have too many bugs which can cause multiple child cursors). As per documentation , REASON column has been introduced in 11.2.0.2 REASON - CLOB Child number, id, and reason the [...]

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Original Post can be viewed at 11gR1 CRS start failing with ORA-29702

This post was actually a comment from Sasi which came on previous article 10.2 CRS startup issue . I am converting it to a post so that we can get some feedback on this issue from other users. I suspect this to be caused by RHEL5 bug (fixed in RHEL5u6) related to NIC going down when [...]

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Original Post can be viewed at AIOUG 2011 – I am Attending :)

All India Oracle User Group(AIOUG) is organizing the annual Oracle Conference in Bangalore on Friday, December 9th and Saturday December 10th, 2011.Arup Nanda is key speaker this year. I will be attending this conference for first time and I am looking forward to meeting fellow bloggers/DBA’s. See you all there You can find the registration link at http://www.aioug.org/sangam11.php [...]

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Original Post can be viewed at Changing CRS/Database timezone in 11.2.0.2 post install

I had installed a 11.2.0.2 RAC setup few days back with incorrect timezone. It had to be PDT but I installed with UTC. Starting/stopping clusteware with correct timezone didn’t solve the issue. In 11.2.0.2 Oracle stores timezone information in file $GRID_HOME/crs/install/s_config_(hostname).txt. In my case file looked like this cd /oragrid/product/11.2/crs/install cat s_crsconfig_prod1.txt <strong>TZ=UTC</strong> NLS_LANG=AMERICAN_AMERICA.AL32UTF8 TNS_ADMIN= [...]

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Original Post can be viewed at 11.2.0.3 Patchset is available

11.2.0.3 patchset is now available for download.  10404530 is available on Linux x86,x86-64 bit only. Tanel Poder first tweeted this Soon after this Surachart and Martin have started upgrading to 11.2.0.3. I expect a blog post soon from one of them Related PostsIn-Place Upgrade 11gR2 RAC : 11.2.0.1 To 11.2.0.2 (7)11.2.0.2 Patchset available.Download directly to server (2)Downloading [...]

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